盛鑫矿回采巷道围岩变形特征及支护技术研究

Study on surrounding rock deformation characteristics and support technology of mining roadway in Shengxin Mine

针对盛鑫煤矿回采巷道围岩变形问题,以该矿42201工作面运输顺槽为工程背景,借助FLAC3D数值模拟软件建立巷道开挖模型,研究了巷道围岩的塑性区分布及应力响应特征。结果表明,运输顺槽掘进后,两帮塑性区深度小于巷道顶底板,两帮塑性区深度控制在1 m以内,顶板塑性区宽度最大,为3.5 m,底板塑性区深度约为1 m。基于数值模拟结果,提出采用“菱形金属网+钢筋梯子梁+锚杆+锚索+混凝土铺底”的联合支护技术,现场应用结果显示,顶板最大移进量为33 mm,两帮最大移进量为18 mm,均小于40 mm,实现了对42201运输顺槽的有效支护。

In view of the deformation of surrounding rock of mining roadway in Shengxin Coal Mine,taking the 42201 working face of the mine as the engineering background,the roadway excavation model was established by FLAC3D numerical simulation software,and the plastic zone distribution and stress response characteristics of surrounding rock of roadway were studied.The results show that the plastic zone depth of the two sides is smaller than that of the roof and floor of the roadway,and the plastic zone depth of the two sides is controlled within 1 m.The plastic zone width of the roof is the largest,which is 3.5 m,and the plastic zone depth of the floor is about 1 m.Based on the numerical simulation results,the combined support technology of'diamond metal mesh+steel ladder beam+anchor rod+anchor cable+concrete bottom'is proposed.The field application results show that the maximum displacement of the roof is 33 mm,and the maximum displacement of the two sides is 18 mm,less than 40 mm,which realizes the effective support for 42201 transport corridor.